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KVR Forum » Mobile Apps and Hardware
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latency with touchscreens - do you feel it when using fader/knobs etc.?
J.C.R.
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PostPosted: Tue Feb 19, 2013 8:14 am reply with quote
Hey,

Afaik all present touch devices have a relatively high latency from the touch screen self. It need a certain amount of ms that the action is registered. I've read about 80-100ms. I wonder with all these controller apps (lemur, touchOSC)..


1.) Do you perceive a lag when riding faders or turning knobs compared to physical, traditional midi controllers?

2.) And how about playing rhythmically on the touch screen (on fake MPC like iMaschine)?

3.) Is this a reason for people to use normal midi controllers on an iPad (like th mpk mini) with a connection kit to get a better playable latency?

I'm really interested how you fell about that or what your experience is.
^ Joined: 04 Apr 2006  Member: #103762  
polaris20
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PostPosted: Tue Feb 19, 2013 9:15 am reply with quote
J.C.R. wrote:
Hey,

Afaik all present touch devices have a relatively high latency from the touch screen self. It need a certain amount of ms that the action is registered. I've read about 80-100ms. I wonder with all these controller apps (lemur, touchOSC)..


1.) Do you perceive a lag when riding faders or turning knobs compared to physical, traditional midi controllers?

2.) And how about playing rhythmically on the touch screen (on fake MPC like iMaschine)?

3.) Is this a reason for people to use normal midi controllers on an iPad (like th mpk mini) with a connection kit to get a better playable latency?

I'm really interested how you fell about that or what your experience is.


I don't notice any lag at all on the iPad 2 and 3. Feels fine to me.
^ Joined: 12 Mar 2005  Member: #61213  
mbncp
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PostPosted: Tue Feb 19, 2013 9:29 am reply with quote
Don't know the touchscreen lag but I don't think it's that high.
If I set sunriser to 128 samples (3msec) I can play really fast lines, but at 2048(48 msec) it'salmost impossible to play, at least never that fast. If the initial lag was over 80 msec I don't think the difference would be that big.
IMO the latency is under 20 msec.
With finger sliding it may be different as it's probably different detecting a click and tracking some movement.
^ Joined: 17 Jul 2003  Member: #8092  
iPlogger
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PostPosted: Tue Feb 19, 2013 10:28 am reply with quote
I've not noticed latency issues. I fiddle around with pianos/e-pianos (sounds with a quick attack) while playing a pattern and I'm able to play just fine. Also able to input drum patterns to a metronome and don't really notice lag.

I do use a MIDI controller, but also enjoy thinking of ideas and playing around on just the iPad itself when I don't want to hook it up or don't have my controller with me.
^ Joined: 27 Oct 2011  Member: #267514  Location: Pacific Northwest
stash98
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PostPosted: Tue Feb 19, 2013 1:55 pm reply with quote
80-100ms?

UHHHH...NO.

Sorry, if that was the case. I would not use my ipad.
^ Joined: 16 Feb 2005  Member: #58150  Location: tittyland
shanecgriffo
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PostPosted: Tue Feb 19, 2013 4:38 pm reply with quote
I have used a couple badly designed apps that had pretty bad latency but deleted them and can't remember them.. Cheap gimmicky ones that had maybe 100ms latency
Otherwise it's all pretty usable
^ Joined: 27 Nov 2003  Member: #10645  Location: beach side australia
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